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Ken Burns: Glacier National Park in trouble

Ken Burns sat down with USA TODAY and shared some of the secrets of America's national parks. Ken Burns and Dayton Duncan are the creators of the PBS documentary "The National Parks: America's Best Idea," available via ShopPBS.org.
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The park boasts over 700 miles of trails across some of the most striking mountains, forests and lakes in the world.

But there is another awe-inspiring feature in Glacier. Watch the video above to find out what Burns calls "... One of the greatest engineering feats in the world ... a revelation, a human testament to what it is to approach and get swallowed up by nature."